package org.example.blog.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.ExpiredJwtException;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.Assert;

import java.security.Key;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@Slf4j
public class JwtUtils {
//    30分钟无效
    private static long expiration = 30 * 60 * 1000;
    private static String secretKey = "suhwuwuyduudhdwhixduudhdwhixduudhdwhixkhhciwhcwihciwhc";
    private static Key key = Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretKey));
//    生成令牌
    public static String genJwt(Map<String, Object> claims) {
        return Jwts.builder()
                .setClaims(claims)
                .setExpiration(new Date(System.currentTimeMillis() + expiration))
                .signWith(key)
                .compact();
    }
//    校验令牌
    public static Claims verify(String token){
        JwtParser build = Jwts.parserBuilder().setSigningKey(key).build();
        Claims claims = null;
        try {
        claims = build.parseClaimsJws(token).getBody();
        }catch (ExpiredJwtException e){
        log.error("token校验失败，token："+token);
        }catch (Exception e){
        log.error("token校验失败，token："+token);
        }
//    返回数据
        return claims;
}
    public static Integer GetUserIdFromToken(String token){
        /*检验token*/
        Claims claims = verify(token);
        Assert.notNull(claims,"token不合法");
        Integer userId = (Integer) claims.get("id");
        return userId;
    }



}
